下霍煤矿2307综采面瓦斯抽采技术应用

Application of Gas Extraction Technology at 2307 Fully-mechanized Mining Face in Xiahuo Colliery

通过分源预测法计算得出2307工作面绝对瓦斯涌出量为2.25 m^(3)/t,瓦斯主要来源于本煤层。为了避免回采期间2307工作面回风隅角、回风巷瓦斯超限,采用本煤层抽采为主、现采采空区抽采及邻近层抽采为辅的瓦斯抽采方式,并设计了各种抽采钻孔、管路参数,抽采本煤层、邻近层及采空区瓦斯,抽采后工作面回风隅角、回风巷瓦斯浓度分别为0.45%、0.25%,瓦斯抽采效果良好,保证了工作面回采安全。

In view of the main gas source from the main coal seam with 2.25 m^(3)/t absolute gas emission at 2307 working face by calculation through the source-based prediction method,a gas extraction method including the design of various extraction drilling holes and pipeline parameters is adopted,mainly based on the extraction of the coal seam,supplemented by the extraction of the existing goaf and adjacent layers to avoid gas overrun in the return airway corner and the ventilation roadway during the mining period,whose extraction results show that the gas concentration in the upper corner of the working face and the return air roadway is 0.45%and 0.25%respectively with good gas extraction effect,ensuring the safety mining at the working face.